Here is a GREAT short film produced by the United States Postal Inspection Service. It examines a popular work at home scam in depth and shows you how to protect yourself. Here is an excerpt from the summary:

Working at home has become attractive to many stay-at-home moms, college students, and retirees. While some jobs are legitimate, others just don't deliver on their promises. This free, short film tells the story of a new type of work-at-home scam and how a young mother gets caught up in it. It also provides tips on how you can avoid being duped by criminals and what to do if you've been victimized. This High Noon Film is presented by the U.S. Postal Inspection Service.